The enzyme specifically hydrolyses (1->4)-beta-D-galactosidic linkages in type I arabinogalactans.

Comment

This enzyme, isolated from the bacterium Bacillus subtilis, hydrolyses the beta(1->4) bonds found in type I plant arabinogalactans, which are a component of the primary cell walls of dicots. The predominant product is a tetrasaccharide. cf. EC 3.2.1.181, galactan endo-beta-1,3-galactanase.